What battle split the south in two, making it impossible for the south to win?

Vicksburg

Explanation:

Union forces captured it and gained control of the Mississippi river, splitting the south in 2. Since General Joseph Johnston didn't come to General Pemberton's aid, the Confederacy lost the battle.

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To emphasize the persistence of racism.

Explanation: Indeed, his descriptions of slavery were used to demonstrate several things; but the most important was that racism was a byproduct of slavery and that it sought to perpetuate it through other forms of oppression. A recurrent argument of Southern white supremacists was that since slavery was over, African Americans now enjoyed equal rights and that segregation ensured such “freedom”. By reminding his followers and listeners that slavery was still perpetuated by the subjugation, segregation, and imprisonment of African Americans.